Contrary to popular belief and to what he NFL wants you to think, there have been fixed games in league history. On page 308 of Dan Moldea's book "Interference" he lists over 70 NFL games that have been fixed and includes the names of the 2 referees involved in fixing those games.
He also lists interviews with NFL HOF players most notably KC Chiefs QB Len Dawson. He, in detail with documented facts supported by FBI documents, has interviews with NFL players and known gambling associates to uncover massive game fixing in the league.
He also notes, with evidence, throughout the book that no fewer than 26 NFL team owners have or have had continuous and developing relationships with the gambling world, most notably the Rooney, Bidwill, and Mara families all getting their starts as Bookmakers for established mid-west crime families and buying their NFL franchises with moneys earned from gambling. So that in and of itself is a hypocrisy number 1 on the NFL's "lilly white" reputation.